A different kind of climate summit comes to San Francisco

It will involve trillions of dollars of pledges for spending on cleaner energy and getting out of investments in heat-trapping fossil fuels, according to officials involved. And it will include a newer way of fighting climate change by emphasizing more climate-friendly land use, food production, and diets, along with massive increases in forests — something one expert called ‘‘the forgotten climate solution.’’ Cities, states, businesses, and charitable foundations are all going to get in the act.

And when you are talking about shifting trillions of dollars to finance initiatives, the private sector needs to get involved and that’s happening, said Nigel Purvis, chief executive officer of the non-profit Climate Advisers and a former climate negotiator in the Bill Clinton and George W. Bush administrations.

‘‘This is the climate action summit, emphasis on the action,’’ Purvis said. ‘‘Despite the lack of leadership from Washington, it’s really about action.’’

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